html, body {
  height: 100%;
}

body {
  background: linear-gradient(#f7f7f7, #e0e0e0);
  margin: 0;
}

.wrap {
  position: relative;
  width: 33.33%;
  margin: -72px 0;
  top: 50%;
  float: left;
}

label {
  margin: 1.5em auto;
}

input {
  position: absolute;
  left: -9999px;
}

.slider-v1 {
  position: relative;
  display: block;
  width: 5.5em;
  height: 3em;
  cursor: pointer;
  border-radius: 1.5em;
  transition: 350ms;
  background: linear-gradient(rgba(0, 0, 0, 0.07), rgba(255, 255, 255, 0)), #ddd;
  box-shadow: 0 0.07em 0.1em -0.1em rgba(0, 0, 0, 0.4) inset, 0 0.05em 0.08em -0.01em rgba(255, 255, 255, 0.7);
}

.slider-v1::before {
  position: absolute;
  content: '';
  width: 2em;
  height: 2em;
  top: 0.5em;
  left: 0.5em;
  border-radius: 50%;
  transition: 250ms ease-in-out;
  background: linear-gradient(#f5f5f5 10%, #eeeeee);
  box-shadow: 0 0.1em 0.15em -0.05em rgba(255, 255, 255, 0.9) inset, 0 0.5em 0.3em -0.1em rgba(0, 0, 0, 0.25);
}

.slider-v1::after {
  position: absolute;
  content: '';
  width: 1em;
  height: 1em;
  top: 1em;
  left: 6em;
  border-radius: 50%;
  transition: 250ms ease-in;
  background: linear-gradient(rgba(0, 0, 0, 0.07), rgba(255, 255, 255, 0.1)), #ddd;
  box-shadow: 0 0.08em 0.15em -0.1em rgba(0, 0, 0, 0.5) inset, 0 0.05em 0.08em -0.01em rgba(255, 255, 255, 0.7), -7.25em 0 0 -0.25em rgba(0, 0, 0, 0.3);
}

input:checked + .slider-v1::after {
  background: linear-gradient(rgba(0, 0, 0, 0.07), rgba(255, 255, 255, 0.1)), #4c6;
  box-shadow: 0 0.08em 0.15em -0.1em rgba(0, 0, 0, 0.5) inset, 0 0.05em 0.08em -0.01em rgba(255, 255, 255, 0.7), -7.25em 0 0 -0.25em rgba(0, 0, 0, 0.12);
}

input:checked + .slider-v1::before {
  left: 3em;
}

.slider-v2 {
  position: relative;
  display: block;
  width: 5.5em;
  height: 3em;
  cursor: pointer;
  border-radius: 1.5em;
  transition: 350ms;
  background: linear-gradient(rgba(0, 0, 0, 0.07), rgba(255, 255, 255, 0)), #ddd;
  box-shadow: 0 0.07em 0.1em -0.1em rgba(0, 0, 0, 0.4) inset, 0 0.05em 0.08em -0.01em rgba(255, 255, 255, 0.7);
}

.slider-v2::after {
  position: absolute;
  content: '';
  width: 2em;
  height: 2em;
  top: 0.5em;
  left: 0.5em;
  border-radius: 50%;
  transition: 250ms ease-in-out;
  background: linear-gradient(#f5f5f5 10%, #eeeeee);
  box-shadow: 0 0.1em 0.15em -0.05em rgba(255, 255, 255, 0.9) inset, 0 0.2em 0.2em -0.12em rgba(0, 0, 0, 0.5);
}

.slider-v2::before {
  position: absolute;
  content: '';
  width: 4em;
  height: 1.5em;
  top: 0.75em;
  left: 0.75em;
  border-radius: 0.75em;
  transition: 250ms ease-in-out;
  background: linear-gradient(rgba(0, 0, 0, 0.07), rgba(255, 255, 255, 0.1)), #d0d0d0;
  box-shadow: 0 0.08em 0.15em -0.1em rgba(0, 0, 0, 0.5) inset, 0 0.05em 0.08em -0.01em rgba(255, 255, 255, 0.7), 0 0 0 0 rgba(68, 204, 102, 0.7) inset;
}

input:checked + .slider-v2::before {
  box-shadow: 0 0.08em 0.15em -0.1em rgba(0, 0, 0, 0.5) inset, 0 0.05em 0.08em -0.01em rgba(255, 255, 255, 0.7), 3em 0 0 0 rgba(68, 204, 102, 0.7) inset;
}

input:checked + .slider-v2::after {
  left: 3em;
}

.slider-v3 {
  position: relative;
  display: block;
  width: 7em;
  height: 3em;
  cursor: pointer;
  border-radius: 1.5em;
  transition: 350ms;
  background: #ddd;
}

.slider-v3::after {
  position: absolute;
  content: '';
  width: 2em;
  height: 2em;
  top: 0.5em;
  left: 0.5em;
  border-radius: 1.5em;
  transition: width 200ms ease-out, height 300ms 50ms ease-in, top 300ms 50ms ease-in, left 250ms 50ms ease-in, background 300ms ease-in, box-shadow 300ms ease-in;
  background: #f2f2f2;
  box-shadow: 0 0 0 1.5em #f2f2f2 inset;
}

input:checked + .slider-v3::after {
  width: 4em;
  height: 3em;
  top: 0;
  left: 3em;
  background: #4c6;
  box-shadow: 0 0 0 0 #f2f2f2 inset;
}
